baelhoffer

Recently noticed a resonance noise coming out of my 04 f150, 5.4 3v. Only will do it after a little while of driving and when going 60mph plus. Comes through the dash, cant tell what side. It will stop when you let out of the gas but not right away, it hangs on for a second before winding down. Wont stay constant, goes in and out. Tried slowing down, speeding up, turning OD off, messing with the stereo. Getting no results. Anybody have any ideas? Thanks guys.